Virtual private network Wikipedia.
VPN technology was developed to allow remote users and branch offices to securely access corporate applications and other resources. To ensure security, data would travel through secure tunnels and VPN users would use authentication methods including passwords, tokens and other unique identification methods to gain access to the VPN.

What Is a VPN, and Why Would I Need One?
When you connect your computer or another device, such as a smartphone or tablet to a VPN, the computer acts as if its on the same local network as the VPN. All your network traffic is sent over a secure connection to the VPN.

What Is A VPN? Virtual Private Networks Explained WhatIsMyIP.com.
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The Best VPN services for 2018 CNET.
Therefore, when you browse the internet while on a VPN, your computer will contact the website through an encrypted VPN service connection. The VPN will then forward the request for you and forward the response from the website back through a secure connection.